Technical Product Specification

Power Subsystem Intel® Server System SR2625UR TPS
Intel order number E46130-010 Revision 1.8
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3.11.3 Cold Redundancy Enabling / Disabling
There shall be a jumper(J15) on the power distribution board to enable/disable Cold
Redundancy and operate in standard redundant load sharing mode(pin1 & pin2 of jumper
connection is shorted means function is enabled, while pin2 & pin3 connected means function
disabled). This jumper shall be accessible without removing a power distribution board cover.
3.11.4 System Power on timing
When powering on, all power supplies shall first turn on. Then only the needed power supplies
to support the load will be left on, the others shall go into cold standby mode.
3.11.5 Power supply fan(s)
Power supply fans shall be powered on at the lowest possible speed when the supply is in cold
standby mode. The fan shall be powered from the 12V bus provided from the active power
supply when in cold standby mode.
3.11.6 Failure Detection and Protection
The power subsystem made up of power supply modules and power distribution board shall
maintain voltage regulation requirements during any fault in the power supplies. Failures of the
active and standby power supplies shall be monitored and reported via PMBus.
3.11.6.1 Power supply failure in active supply
Each power supply shall communicate a failure via its PWOK signal. The failure shall be
communicated about 200usec before the output voltage drops below regulation limits.
The power supply in cold standby mode shall turn on within about 200usec of receiving the
power supply
The output voltages from the power distribution board shall stay within regulation limits during
any failure of the active power supply. This shall be true under any line, load, or temperature
operating condition.
3.11.6.2 Checking for failures in Cold Standby Power Supply
A method to detect a failure in the power supply in cold standby mode shall be provided.
o The power supply in cold standby state shall be powered on about 1 time every week.
When powered on it shall be left on for between 10-20 seconds.
o If a failure is detected in the cold standby supply, it asserts the PMBus VOUT bit in the
STATUS_WORD command.
o If the power distribution board detects the cold standby power supply has failed; it shall
leave the power supplies PSON# signal asserted and stop power cycling. Only after
replacing the failed power supply shall the power distribution board continues cycling the
cold standby power supply on/off.
3.11.6.3 PMBus used as failure indicator
PMBus STATUS_ commands shall be used to communicate a failure of the active and cold
standby power supplies.
o The VOUT bit in STATUS_WORD shall be used as a general fault bit to indicate a failure
of the active or cold standby power supply.